Start migration to using flake-parts

features-nixos/optional/openssh.nix

@@ -0,0 +1,51 @@
+{
+  flake.nixosModules.openssh = {
+    outputs,
+    lib,
+    config,
+    ...
+  }: let
+    hosts = lib.attrNames outputs.nixosConfigurations;
+  in {
+    services.openssh = {
+      enable = true;
+      settings = {
+        # Harden
+        PasswordAuthentication = false;
+        PermitRootLogin = "no";
+
+        # TODO: what does this do
+        # Let WAYLAND_DISPLAY be forwarded
+        AcceptEnv = "WAYLAND_DISPLAY";
+        X11Forwarding = true;
+      };
+
+      hostKeys = [
+        {
+          path = "/etc/ssh/ssh_host_ed25519_key";
+          type = "ed25519";
+        }
+      ];
+    };
+
+    # TODO: is automatic known hosts file even necessary?
+    # programs.ssh = {
+    #   # Each hosts public key
+    #   knownHosts = lib.genAttrs hosts (hostname: {
+    #     publicKeyFile = ../../${hostname}/ssh_host_ed25519_key.pub;
+    #     extraHostNames =
+    #       [
+    #         # "${hostname}.m7.rs"
+    #       ]
+    #       ++
+    #         # Alias for localhost if it's the same host
+    #         (lib.optional (hostname == config.networking.hostName) "localhost")
+    #       # Alias to m7.rs and git.m7.rs if it's alcyone
+    #       ++ (lib.optionals (hostname == "alcyone") [
+    #         "m7.rs"
+    #         "git.m7.rs"
+    #       ]);
+    #   });
+    # };
+  };
+}